Transanal Endoscopic Operation

**Semantic type:** Therapeutic or Preventive Procedure

**Definition:** Transanal endoscopic surgery that use a rigid operating proctoscope, similar to transanal endoscopic microsurgery (TEM), but offers proctoscope lengths of 7.5, 15, and 20 cm and an option to use a conventional 5 mm laparoscope instead of the binocular optics system.

**Synonyms:** - TEO